Painted Cinder Block Walls

 
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Old 06-14-2010, 07:00 PM   #1
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Painted Cinder Block Walls


Anyone blasted paint off cinder-block walls?

I have a contractor that I do work for that wants me to do some in a building, Since I haven't done any, I wanted to get some feedback.

They are asking for 70 percent removal. Not really asking for a price just wondering how they hold up, is it do-able etc.

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Old 06-14-2010, 08:16 PM   #2
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Re: Painted Cinder Block Walls


I just did this a month ago,
rough face block. they held up really good. morter slightly came out but not bad.

it was farly new paint (3 or 4 years old) Latex came off fast.
maybe 350 sqft hour.

we removed 2100 sqft in 6 hours with clean up.

Used med crushed glass.

sounds like you are doing the smooth face ones? I would think they would stand up good, unless there old?
and there inside (just thought I'd post some pic to help see)

hope this helps ya...
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Old 06-14-2010, 08:17 PM   #3
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Re: Painted Cinder Block Walls


Do it with Starblast or crushed glass. One of those will definitely remove the paint at least 70% and not damage the block.
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Old 06-14-2010, 09:57 PM   #4
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Re: Painted Cinder Block Walls


Jim, Those look more like brick to me? I have the larger white cinder block type walls in my blast bay. They are pretty old block maybe 30 years + I was testing some paint removal and it was just crawling off very slowly and it did chew them up a bit. You just never know with paint. Might get 350 s.f. per hour and somtimes 60. Gotta test or charge per bag. Both is best.
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Old 06-15-2010, 05:24 AM   #5
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Re: Painted Cinder Block Walls


Your right glen, it depends on the paint type and how many years of painting too.

The block in my pics are the same size as a cement block. they look like brick because of the paint color.
They are made out of cement but the face of them was Not Smooth but rough
and the paint was only 3 years old.
we had to strip them because no one sealed them and the building was leaking!

Glen, have you tryed walnut shell on block for paint?
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Old 06-15-2010, 07:20 AM   #6
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Re: Painted Cinder Block Walls


Thanks guys,
I should have given more details, Its an old building, so I am guessing that the paint is old and it has probably been painted several times. But like you guys said you never know with paint. They are planning to skim the mortar back in after I am done, so as long as I don't totally destroy everything, It should be ok. Jim did that solve the leaking problem after you were done?

Thanks
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Old 06-15-2010, 06:07 PM   #7
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Re: Painted Cinder Block Walls


Jim I think I did shoot some of evrything at that wall even some garnet. The walnut always going to be slower and more expensive but if you had to de paiaint without getting a profile or too much glass to mask off it would be wort it. I just got a pallet of walnut in. I can't rember the companies name right now but they had a very good price about 16 a bag and they have warehouses all over so I got very good shipping too. If anywants the name e mail me and I'll look at my recipt again.
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Old 06-15-2010, 08:00 PM   #8
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Re: Painted Cinder Block Walls


Quote:
Originally Posted by rlaird View Post
Thanks guys,
Jim did that solve the leaking problem after you were done?

Thanks
Rick
I talked to the guy that painted, about a month after, and as far as we know, theres no leaks.

the med glass worked good, it clean the bricks (blocks) with out damage
and took some of the mortor out so all the masons had to do is point it.

as a note the masons loved it, they liked the way the blast cleaned out the jonts.
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Old 06-17-2010, 01:55 PM   #9
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Re: Painted Cinder Block Walls


Thanks for the input Jim.
I have had run into a customer with a similar problem but did not
know if it would work
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Old 06-17-2010, 08:05 PM   #10
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Re: Painted Cinder Block Walls


Getting hook up with a few masons is a good thing

the blast alone saves them time of grinding out the joints
especally on the big jobs!

if you didn't have to take paint off, it would be a fast job!!!!

good selling point!
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Old 06-17-2010, 08:31 PM   #11
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Re: Painted Cinder Block Walls


I have the same problem in my basement, 1950s house with 8" cinder block. some moron put non drylock type paint all the way to the floor and with some water problems in the past, it's impossible for me to seal them now. i want to take at least the bottom several courses down to bare block and let the dry/ seal them up.
i don't want that mess down there, so i've never got around to doing it. i'm not a sandblaster. i don't think there is a way to do it without making a huge mess.
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Old 06-18-2010, 05:29 AM   #12
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Re: Painted Cinder Block Walls


Dan, I've done a basement before for a friend thats a contractor.
the house was in a remodel state but still had to keep the mess contained to the basement.

It was not Block, but had the same NON sealed walls.
the contractor sealed it and at the sales of the house the people were very impressed at how good the basement looked after blasting.
and it fixed the water stain problem...

we taped and pluged any through holes that went upstairs, wrapped the fernice in plastic and taped tightly shut.

Used a black max fan (next time two would be better) to pull dust into a dust sock.

when done, swept and cleaned up a few times to make sure it was clean.

when we were blasting, I didn't know that the sheet rockers should up to do the taping on the walls.... They said it wasn't dusty at all, and didn't bother them at all? (and ya, they were upstairs, not down stairs with me..)

Glen; do you think walnut on this might of been a bit slower but less dust?

I used med glass, it did etch the surface quite a bit, but the paint covered it up.
next time I'd use a fine glass
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Old 06-18-2010, 05:58 AM   #13
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Re: Painted Cinder Block Walls


I'd be afraid of damaging the softer cinderblocks. we have our washer/dryer down there also, they'd have to be moved out. how dusty were the floor joists? coated? i have a bilco door that i can open and have a huge fan blowing out.

a year ago, i had a concrete wet saw , 14" gas powered running down there cutting a channel in the slab for a drain. i cut a 6" wide opening 3' from the walls (monolithic pour i think for the slab/footing) and that dust was pretty bad but i had the staircase wrapped in plastic and other things taped up too.

i wonder how a chemical stripper would work for taking the crappy paint off. the upper block look fine and never leak but the lower 3 rows of block have stains on them from water level outside. i have a gutter system that allows some water to come in and run to my new pit drain in the corner. i don't want to plug all water out because it'll put too much pressure on the blocks, i doubt they have a footing drain, if it's there it's old orangeberg pipe and it's plugged.
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Old 06-18-2010, 09:47 AM   #14
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Re: Painted Cinder Block Walls


There's still pretty much dust with walnut too Jim. If the job could pay enough renting a sponge blaster would be the cool way.
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Old 06-18-2010, 12:10 PM   #15
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Re: Painted Cinder Block Walls


What about dry ice how would that be for dust. Any dry ice guys?
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Old 06-18-2010, 01:09 PM   #16
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Re: Painted Cinder Block Walls


DRY ICE = EXPENSIVE for the average homeowner.
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Old 06-18-2010, 06:25 PM   #17
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Re: Painted Cinder Block Walls


How bad do you want it fixed! Do you want dust or not.

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Old 06-18-2010, 07:12 PM   #18
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Re: Painted Cinder Block Walls


I could blast it without dust getting all over the place. No problem.
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Old 06-18-2010, 09:15 PM   #19
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Re: Painted Cinder Block Walls


i know there is going to be some dust. but as i'm not a blaster. i was simply asking how much dust and how bad it would be from people who have done it.

it's not something i have to have done. but would be nice to know it's stripped, and painted with the right paint
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Old 06-18-2010, 10:49 PM   #20
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Re: Painted Cinder Block Walls


All you have to do is build a enclosure down the wall about six feet away from the wall. Seal it around the floor joist depending on the way they are running and seal it at the floor and then run ventilation so you have a negative pressure on the containment and there you go. You can blast all day long and not bother anyone except for the noise. We do it all the time in the industry. You will need a dust sock on the exaust fan so to keep the dust down on the exterior of the basement. Your exaust fan would have to be of enough size to draw the air out at enough rate as to keep negative pressure on the containment during the blasting as well. Very simple and not a big extra cost as well. The tarps that you use would have to be heavy enough so the bounce back of the abrasive does not tear it up. We use tarps that is made for use during abrasive blasting so they hold up well.

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